Cisco AP541N Dual-band Single-radio Access Point Administration ...

WirelessConfiguring Quality of Service (QoS)4Table 24QoS Parameters (Continued)FieldcwMax(MaximumContention Window)DescriptionThe value specified here in the Maximum ContentionWindow is the upper limit (in milliseconds) for the doublingof the random backoff value. This doubling continues untileither the data frame is sent or the Maximum ContentionWindow size is reached.TXOP LimitOther QoS SettingsNoAcknowledgementAutomatic PowerSave DeliveryOnce the Maximum Contention Window size is reached,retries will continue until a maximum number of retriesallowed is reached.The TXOP Limit is a station EDCA parameter and onlyapplies to traffic flowing from the client station to theaccess point. The Transmission Opportunity (TXOP) is aninterval of time, in milliseconds, when a client has the rightto initiate transmissions towards the access point. TheTXOP Limit maximum value is 65535.Select On to specify that the access point should notacknowledge frames with QosNoAck as the service classvalue.Select On to enable Automatic Power Save Delivery(APSD), which is a power management method. APSD isrecommended if VoIP phones access the network throughthe access point.NOTEAfter you configure the QoS settings, you must click Apply to apply the changesand to save the settings. Changing some settings might cause the access point tostop and restart system processes. If this happens, wireless clients will temporarilylose connectivity. We recommend that you change access point settings whenWLAN traffic is low.Cisco AP 541N Dual-band Single-radio Access Point Quick Start Guide 102